The AT4 trim available on the Sierra Heavy Duty trucks, adds skid plates, off-road suspension with Rancho shocks, an off-road mode, the MultiPro tailgate, and a camera system to make towing easier. Also standard are 18-inch wheels wrapped in all-terrain tires.

AT4: PIONEER OF PREMIUM OFF-ROAD Sierra 1500 AT4 offers powerful capability engineered to take you to the places your boundless sense of adventure can imagine. Ruggedly styled and equipped with tech-savvy and intuitive advanced features, Sierra 1500 AT4 is adventure-ready and engineered for action.

Fort Wayne, Indiana It's one of the busiest assembly plants in GM's portfolio and produces over 500 full-size GMC Sierra 1500s every day. In order to facilitate efficient production of the Sierra, the plant employs over 4,400 people and uses almost 2,300 robots throughout the facility.

Essentially, AT4 GMC is short for an “all-terrain 4WD” vehicle, and it is an off-roading package that you can attach to your GMC models. The goal is to have a vehicle that works on Perham streets as well as off-roading trails.

The name AT4 is a word play on the 84 mm caliber of the weapon, (84) 'eighty four' being a homophone of 'A-T-4'. The name also doubles as an alpha-phonetic word play on the weapon's role, due to "AT" being a common military abbreviation for "anti-tank".

Now in terms of off-road again we already talked about the suspension. We talked about the skid plates underneath. But another one we have to talk about is right down here.

AT4 offers powerful capability engineered to take on off-road obstacles and the tough backcountry. AT4 capability features include: Factory-installed 2" suspension lift. 2-speed AutoTrac transfer case, automatic locking rear differential and skid plates.

Now in terms of off-road again we already talked about the suspension. We talked about the skid plates underneath. But another one we have to talk about is right down here.

GMC stands for General Motors Co., which is a subsidiary of General Motors. GM also controls the Chevrolet, Buick and Cadillac brands in the U.S. GMC is most famous for its truck-focused lineup of vehicles, though it currently offers SUVs and vans in addition to pickup trucks.

AT4 Trim Explained The AT4 trim stands for All-Terrain 4WD, and was first available on the GMC Sierra 1500. Now you'll find many GMC vehicles with the available AT4 trim, including the GMC Canyon, GMC Acadia, GMC Yukon, and GMC Terrain. The GMC Sierra 1500 also still has an available AT4 trim.

If you want to take off-roading to the next level and enjoy a sophisticated interior, the AT4X is the way to go. The Denali trim is made for those who spend a lot of time in their vehicles. If your SUV or truck interior is basically your second home, you might as well have it be a place you love to exist.

Every driver wants to get behind the wheel of a new truck that can offer them the most innovative technology, the most power, the highest towing and hauling capacity and excellent safety protection. If these are qualities you're looking for, the GMC Sierra 1500 is a perfect choice.